Lancaster University / mbed-src

Lancaster University's (short term!) clone of mbed-src for micro:bit. This is a copy of the github branch https://github.com/lancaster-university/mbed-classic

Fork of mbed-src by mbed official

cpp/FileSystemLike.cpp@0:fd0d7bdfcdc2, 2012-11-20 (annotated)

Committer:
mbed_official
Date:
Tue Nov 20 17:24:08 2012 +0000
Revision:
0:fd0d7bdfcdc2
Child:
1:62685faffa05
mbed sources

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:fd0d7bdfcdc2 1 /* mbed Microcontroller Library
mbed_official 0:fd0d7bdfcdc2 2 * Copyright (c) 2006-2012 ARM Limited
mbed_official 0:fd0d7bdfcdc2 3 *
mbed_official 0:fd0d7bdfcdc2 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
mbed_official 0:fd0d7bdfcdc2 5 * of this software and associated documentation files (the "Software"), to deal
mbed_official 0:fd0d7bdfcdc2 6 * in the Software without restriction, including without limitation the rights
mbed_official 0:fd0d7bdfcdc2 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
mbed_official 0:fd0d7bdfcdc2 8 * copies of the Software, and to permit persons to whom the Software is
mbed_official 0:fd0d7bdfcdc2 9 * furnished to do so, subject to the following conditions:
mbed_official 0:fd0d7bdfcdc2 10 *
mbed_official 0:fd0d7bdfcdc2 11 * The above copyright notice and this permission notice shall be included in
mbed_official 0:fd0d7bdfcdc2 12 * all copies or substantial portions of the Software.
mbed_official 0:fd0d7bdfcdc2 13 *
mbed_official 0:fd0d7bdfcdc2 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
mbed_official 0:fd0d7bdfcdc2 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
mbed_official 0:fd0d7bdfcdc2 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
mbed_official 0:fd0d7bdfcdc2 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
mbed_official 0:fd0d7bdfcdc2 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
mbed_official 0:fd0d7bdfcdc2 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
mbed_official 0:fd0d7bdfcdc2 20 * SOFTWARE.
mbed_official 0:fd0d7bdfcdc2 21 */
mbed_official 0:fd0d7bdfcdc2 22 #include "FileSystemLike.h"
mbed_official 0:fd0d7bdfcdc2 23
mbed_official 0:fd0d7bdfcdc2 24 namespace mbed {
mbed_official 0:fd0d7bdfcdc2 25
mbed_official 0:fd0d7bdfcdc2 26 FileSystemLike::FileSystemLike(const char *name) {
mbed_official 0:fd0d7bdfcdc2 27 _name = name;
mbed_official 0:fd0d7bdfcdc2 28
mbed_official 0:fd0d7bdfcdc2 29 if (name != NULL) {
mbed_official 0:fd0d7bdfcdc2 30 // put this object at head of the list
mbed_official 0:fd0d7bdfcdc2 31 _next = _head;
mbed_official 0:fd0d7bdfcdc2 32 _head = this;
mbed_official 0:fd0d7bdfcdc2 33 } else {
mbed_official 0:fd0d7bdfcdc2 34 _next = NULL;
mbed_official 0:fd0d7bdfcdc2 35 }
mbed_official 0:fd0d7bdfcdc2 36 }
mbed_official 0:fd0d7bdfcdc2 37
mbed_official 0:fd0d7bdfcdc2 38 FileSystemLike::~FileSystemLike() {
mbed_official 0:fd0d7bdfcdc2 39 if (_name != NULL) {
mbed_official 0:fd0d7bdfcdc2 40 // remove this object from the list
mbed_official 0:fd0d7bdfcdc2 41 if (_head == this) { // first in the list, so just drop me
mbed_official 0:fd0d7bdfcdc2 42 _head = _next;
mbed_official 0:fd0d7bdfcdc2 43 } else { // find the object before me, then drop me
mbed_official 0:fd0d7bdfcdc2 44 FileSystemLike* p = _head;
mbed_official 0:fd0d7bdfcdc2 45 while (p->_next != this) {
mbed_official 0:fd0d7bdfcdc2 46 p = p->_next;
mbed_official 0:fd0d7bdfcdc2 47 }
mbed_official 0:fd0d7bdfcdc2 48 p->_next = _next;
mbed_official 0:fd0d7bdfcdc2 49 }
mbed_official 0:fd0d7bdfcdc2 50 }
mbed_official 0:fd0d7bdfcdc2 51 }
mbed_official 0:fd0d7bdfcdc2 52
mbed_official 0:fd0d7bdfcdc2 53 FileSystemLike *FileSystemLike::lookup(const char *name, unsigned int len) {
mbed_official 0:fd0d7bdfcdc2 54 FileSystemLike *p = _head;
mbed_official 0:fd0d7bdfcdc2 55 while (p != NULL) {
mbed_official 0:fd0d7bdfcdc2 56 /* Check that p->_name matches name and is the correct length */
mbed_official 0:fd0d7bdfcdc2 57 if (p->_name != NULL && std::strncmp(p->_name, name, len) == 0 && std::strlen(p->_name) == len) {
mbed_official 0:fd0d7bdfcdc2 58 return p;
mbed_official 0:fd0d7bdfcdc2 59 }
mbed_official 0:fd0d7bdfcdc2 60 p = p->_next;
mbed_official 0:fd0d7bdfcdc2 61 }
mbed_official 0:fd0d7bdfcdc2 62 return NULL;
mbed_official 0:fd0d7bdfcdc2 63 }
mbed_official 0:fd0d7bdfcdc2 64
mbed_official 0:fd0d7bdfcdc2 65 class BaseDirHandle : public DirHandle {
mbed_official 0:fd0d7bdfcdc2 66 public:
mbed_official 0:fd0d7bdfcdc2 67 /*
mbed_official 0:fd0d7bdfcdc2 68 We keep track of our current location as the n'th object in the
mbed_official 0:fd0d7bdfcdc2 69 FileSystemLike list. Using a Base* instead would cause problems if that
mbed_official 0:fd0d7bdfcdc2 70 object were to be destroyed between readdirs.
mbed_official 0:fd0d7bdfcdc2 71 Using this method does mean though that destroying/creating objects can
mbed_official 0:fd0d7bdfcdc2 72 give unusual results from readdir.
mbed_official 0:fd0d7bdfcdc2 73 */
mbed_official 0:fd0d7bdfcdc2 74 off_t n;
mbed_official 0:fd0d7bdfcdc2 75 struct dirent cur_entry;
mbed_official 0:fd0d7bdfcdc2 76
mbed_official 0:fd0d7bdfcdc2 77 BaseDirHandle() {
mbed_official 0:fd0d7bdfcdc2 78 n = 0;
mbed_official 0:fd0d7bdfcdc2 79 }
mbed_official 0:fd0d7bdfcdc2 80
mbed_official 0:fd0d7bdfcdc2 81 virtual int closedir() {
mbed_official 0:fd0d7bdfcdc2 82 delete this;
mbed_official 0:fd0d7bdfcdc2 83 return 0;
mbed_official 0:fd0d7bdfcdc2 84 }
mbed_official 0:fd0d7bdfcdc2 85
mbed_official 0:fd0d7bdfcdc2 86 virtual struct dirent *readdir() {
mbed_official 0:fd0d7bdfcdc2 87 FileSystemLike *ptr = FileSystemLike::_head;
mbed_official 0:fd0d7bdfcdc2 88 /* Find the n'th FileLike or FileSystemLike object in the Base list */
mbed_official 0:fd0d7bdfcdc2 89 int m = 0;
mbed_official 0:fd0d7bdfcdc2 90 while (1) {
mbed_official 0:fd0d7bdfcdc2 91 if (ptr == NULL) {
mbed_official 0:fd0d7bdfcdc2 92 /* No such object */
mbed_official 0:fd0d7bdfcdc2 93 return NULL;
mbed_official 0:fd0d7bdfcdc2 94 }
mbed_official 0:fd0d7bdfcdc2 95 if (m == n) break;
mbed_official 0:fd0d7bdfcdc2 96
mbed_official 0:fd0d7bdfcdc2 97 m++;
mbed_official 0:fd0d7bdfcdc2 98 ptr = ptr->_next;
mbed_official 0:fd0d7bdfcdc2 99 }
mbed_official 0:fd0d7bdfcdc2 100 /* Increment n, so next readdir gets the next item */
mbed_official 0:fd0d7bdfcdc2 101 n++;
mbed_official 0:fd0d7bdfcdc2 102 /* Setup curentry and return a pointer to it */
mbed_official 0:fd0d7bdfcdc2 103 std::strncpy(cur_entry.d_name, ptr->_name, NAME_MAX);
mbed_official 0:fd0d7bdfcdc2 104 return &cur_entry;
mbed_official 0:fd0d7bdfcdc2 105 }
mbed_official 0:fd0d7bdfcdc2 106
mbed_official 0:fd0d7bdfcdc2 107 virtual off_t telldir() {
mbed_official 0:fd0d7bdfcdc2 108 return n;
mbed_official 0:fd0d7bdfcdc2 109 }
mbed_official 0:fd0d7bdfcdc2 110
mbed_official 0:fd0d7bdfcdc2 111 virtual void seekdir(off_t offset) {
mbed_official 0:fd0d7bdfcdc2 112 n = offset;
mbed_official 0:fd0d7bdfcdc2 113 }
mbed_official 0:fd0d7bdfcdc2 114
mbed_official 0:fd0d7bdfcdc2 115 virtual void rewinddir() {
mbed_official 0:fd0d7bdfcdc2 116 n = 0;
mbed_official 0:fd0d7bdfcdc2 117 }
mbed_official 0:fd0d7bdfcdc2 118 };
mbed_official 0:fd0d7bdfcdc2 119
mbed_official 0:fd0d7bdfcdc2 120 DirHandle *FileSystemLike::opendir() {
mbed_official 0:fd0d7bdfcdc2 121 return new BaseDirHandle();
mbed_official 0:fd0d7bdfcdc2 122 }
mbed_official 0:fd0d7bdfcdc2 123
mbed_official 0:fd0d7bdfcdc2 124 FileSystemLike *FileSystemLike::_head = NULL;
mbed_official 0:fd0d7bdfcdc2 125
mbed_official 0:fd0d7bdfcdc2 126
mbed_official 0:fd0d7bdfcdc2 127 FilePath::FilePath(const char* file_path) : file_name(NULL), fs(NULL) {
mbed_official 0:fd0d7bdfcdc2 128 if ((file_path[0] != '/') || (file_path[1] == 0)) return;
mbed_official 0:fd0d7bdfcdc2 129
mbed_official 0:fd0d7bdfcdc2 130 const char* file_system = &file_path[1];
mbed_official 0:fd0d7bdfcdc2 131 file_name = file_system;
mbed_official 0:fd0d7bdfcdc2 132 int len = 0;
mbed_official 0:fd0d7bdfcdc2 133 while (true) {
mbed_official 0:fd0d7bdfcdc2 134 char c = *file_name++;
mbed_official 0:fd0d7bdfcdc2 135 if (c == '/') { // end of object name
mbed_official 0:fd0d7bdfcdc2 136 /* file now points to one char after the '/' */
mbed_official 0:fd0d7bdfcdc2 137 break;
mbed_official 0:fd0d7bdfcdc2 138 }
mbed_official 0:fd0d7bdfcdc2 139 if (c == 0) { // end of object name, with no filename
mbed_official 0:fd0d7bdfcdc2 140 file_name = NULL;
mbed_official 0:fd0d7bdfcdc2 141 break;
mbed_official 0:fd0d7bdfcdc2 142 }
mbed_official 0:fd0d7bdfcdc2 143 len++;
mbed_official 0:fd0d7bdfcdc2 144 }
mbed_official 0:fd0d7bdfcdc2 145
mbed_official 0:fd0d7bdfcdc2 146 fs = FileSystemLike::lookup(file_system, len);
mbed_official 0:fd0d7bdfcdc2 147 }
mbed_official 0:fd0d7bdfcdc2 148
mbed_official 0:fd0d7bdfcdc2 149 const char* FilePath::fileName(void) {
mbed_official 0:fd0d7bdfcdc2 150 return file_name;
mbed_official 0:fd0d7bdfcdc2 151 }
mbed_official 0:fd0d7bdfcdc2 152
mbed_official 0:fd0d7bdfcdc2 153 FileSystemLike* FilePath::fileSystem(void) {
mbed_official 0:fd0d7bdfcdc2 154 return fs;
mbed_official 0:fd0d7bdfcdc2 155 }
mbed_official 0:fd0d7bdfcdc2 156
mbed_official 0:fd0d7bdfcdc2 157 FileSystemLike* FilePath::getFileSystem(const char* path) {
mbed_official 0:fd0d7bdfcdc2 158 FilePath f(path);
mbed_official 0:fd0d7bdfcdc2 159 return f.fs;
mbed_official 0:fd0d7bdfcdc2 160 }
mbed_official 0:fd0d7bdfcdc2 161
mbed_official 0:fd0d7bdfcdc2 162 } // namespace mbed